Question about 1996 Jeep Grand Cherokee

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1996 grand cherokee charging problem when really cold

I have changed the altenator the belt the battery the pullys and I still have the gage go down to 0 when it is cold out. When I start the truck it will go to 14 after 10 min it drops to 0. When driving it is fine but when I stop at a red light it will drop again to 0. I dont know what else to change.

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  • jenn1441 Jan 25, 2009

    everything is factory to best of my knowledge I have a mechanic replace everything





  • jenn1441 Jan 25, 2009

    what is really strange is when it is only really cold I did not
    have a problem in the summer at all just in the winter. they
    think because of the way the pully system is on the 96 it soes not hve
    the auto tentioner that the belt might still be slipping but it will
    not go any tighter if we loosen it at all I have squelling and total
    lose of charging

    there is also a temperature sensor under the battery which is the last thing I can change I just dont know anymore



  • jenn1441 Jan 25, 2009

    oh yeah if you turn the car off and turn it back on it will go right back up to 14 this has me baffled

  • jenn1441 Jan 25, 2009

    yes the battery is not charging when it goes to 0 for some reason the altenator is turning off

  • jenn1441 Jan 25, 2009

    4.0l

  • jenn1441 Jan 25, 2009

    it is an inline fuse for the alternator everything was cleaned

  • jenn1441 Jan 25, 2009

    yes it does

  • jenn1441 Jan 25, 2009

    slot 1 is the generator output 175A mega black

  • jenn1441 Jan 25, 2009

    I dont know much about schmatics and I never reallly reved it to bring
    it back up I know that if I drive for about one minute or so it does
    come back up

  • jenn1441 Jan 25, 2009

    this is the second alternator it has been doing it with so all
    the conectors were checked and cleaned when I replaced it yes you are
    correct with the wire colours my last option is the battery temp sensor






  • jenn1441 Jan 25, 2009

    thank you for all your help I really appreciate it

  • Mike Butler
    Mike Butler May 11, 2010

    At least see what happens when it's removed from circuit/disconnected. Only other thing that comes to mind is to install a smaller pulley on alternator, but if same size as factory, shouldn't be necessary. I have a buddy with Chrysler service, I'm going to pick his brain on this one and see what I can turn up, but may take a day or so, as he's on the road to warmer weather than what we have here, lucky dog. I know in the past with old generators & first generation alternators, you had to hit a certain RPM before they put out, but that's not the case now, unless they slipped one by me. I'm going to see if I can find a schematic that shows wire from gauge to battery. The gauge should still get a reading from battery even if alternator not charging.

  • Mike Butler
    Mike Butler May 11, 2010

    Schematic shows wires from alternator go as follows. Dark green & black wire, goes back to powertrain control module. Dark green & Orange wire, goes to ignition coil. Is this correct from what you can see? Double check coil holdown etc is all tight, as in ground side, and check wire connectors etc on coil. How hard is it to get to powertrain control module connections, to clean & inspect them? As far as battery temperature sensor goes, it is controlled through same module, so it could be causing the problem. Do/can you see numbers & letters by all the wires coming out of the powertrain control modules?

  • Mike Butler
    Mike Butler May 11, 2010

    O.K. think I've located proper schematic. Can you read a schematic somewhat?

    Something else, when gauge drops to 0, how much do you have to rev it, to get it to come back up?

  • Mike Butler
    Mike Butler May 11, 2010

    What is #1 slot ? Looking for a high amp fuse or circuit breaker, min 125Amps

  • Mike Butler
    Mike Butler May 11, 2010

    Do you not have a power distribution box under the hood somewhere?

  • Mike Butler
    Mike Butler May 11, 2010

    You've cleaned and checked all ground sources I take it? That 125 Amp circuit for alternator, I take it is in engine area power disribution box. Is it a fuse, or circuit breaker?

  • Mike Butler
    Mike Butler May 11, 2010

    4.0L or 5.2L engine?

  • Mike Butler
    Mike Butler May 11, 2010

    Has anyone put a voltmeter on battery when gauge reads O ?

  • Mike Butler
    Mike Butler May 11, 2010

    I'll do some digging & get back to you a.s.a.p. Weird one!

  • Mike Butler
    Mike Butler May 11, 2010

    Is this factory gauge, or is it aftermarket, someone else hooked it up?

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  • Jeep Master
  • 6,674 Answers

Your welcome, will get back to you a.s.a.p. Let me know what happens if/when you disconnect that battery temp sensor.

Posted on Jan 25, 2009

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